[YANG] 7.6, default value for a type

Hi,

Sec 7.6, para 5 says:

    If a leaf has a "default" statement, the leaf's default value is set
    to the value of the "default" statement.  Otherwise, if the leaf's
    type has a default value, and the leaf is not mandatory, then the
    leaf's default value is set to the type's default value.  In all
    other cases, the leaf does not have a default value.

The default value for each builtin type is not defined anywhere.
This is a nice detail, and covers things like the agent creating
a bunch of counter objects or ifOperStatus objects.

It mandates that a specific value will be used, not random values.

What are the specific values?

   - int8 to uint64: 0
   - float32, float64: 0.0
   - string, binary, instance-identifier: empty string
   - enumeration:  ???  (!) [first value?]
   - boolean: false
   - bits: empty bitset
   - keyref:  default for data type of 'path'

Andy

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